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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14481ddf501f27bd68351f0252c85e99437abccb77b56e8f8c90b8465d31c86d' 
  AND token = 'pdVIKn/l82DD58Y+sUzkRppXzweNxQe8RRSmPW5pXAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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