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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd139e489cec639ce8371c13db911d43d58be07e174f20a82bb028cf4183d2e38' 
  AND token = 'G0MdW8KXOPRnX+JuAq7Z1UaK8y1TrdYa9jYXU5Mct6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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