SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a67f1361619a858bc5dba62bdfb17a3f356937dbf329da7c6642af33ec62a4e' 
  AND token = 'YLijAa9EiIfmJZ7sV+kEnvmKjztyge8lys//4ErKWFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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