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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b697035659e30e9e34fafa0e58555f29e03ea4f7b9c50c3272201129d96a6a14' 
  AND token = 'h6TyIgV9A/E7zBp3Lv/lWS8O8M+eaggqoZbeGaifI+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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