SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee187b9214c1845f0a9873f73d4583f99ce0d2972441f70c16218c673eae1164' 
  AND token = 'BBSuptCFTWYVZyIsyIoJ/gEewJ1OUtzC2xJdXnNG5vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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