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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5f6e2bc9f27132887c4a062fd4fb7bcfc8cdc3ed57f5806b04737695cef532' 
  AND token = 'kSHpxBRr1cHsFH9J8SE7bwIUxQazj51P0L1Q5tLWaMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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