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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4684b2623aebe9dcbb73283ce456ae9a3a7c202dca6dc7ba5ad3567f8a0271b' 
  AND token = 'QZVm0iGir1/X6PdfBVUk8YeO4kEtrgc6UXt3JU6+uDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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