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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43b0d7055f537348567ae1df14e9d3773adc411f0b72e6ce5eb7633d32137cd' 
  AND token = 'ZLC8xPrKtdYbdG1i/Z9JTcBPiY0brNi5AZB2wuOTxzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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