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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19b72cdd162eaa6cf5070e726730eacb7cec97e5ba46ab8ffbd7be7ba5a7ea' 
  AND token = 'zOC9eQW1t3aa0vphk+9ZkQTUDkDdrvhEFCQmAhxsvio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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