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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba528c9c1dc5bd30ce5396af5992b8fbdeb7ddd27fbc0e34fc1721b6ad05fb4d' 
  AND token = '9QrfLLKC8ZiWJL6QiX8XSeClkgt7vqPr5y6QLM/T4Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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