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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa1cfd548eabd60b0530935b9059cd1d67bc44ac32b1426f5d86a12ca8dbbe5' 
  AND token = 'B8IoZ0HAF9n5ieGbMUdK8jzHJbv+Mb6jJhLon0DPG2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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