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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba11397fd0ff7d9f15538fa41524a23586f901ce7c1bcce2eecf93aa799d80d2' 
  AND token = '13GN4E04EFsVveUPBUyeht2XeUPi6N7xiN83VlG0UZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}