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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919b2676cc9eb47d6deb1fd924c654bd036aebf5b0c04438c19bc95479b35dae' 
  AND token = '5YoVecxKyJ6GVVCuvzAqW8bF5jjpvt8VJQFcWtUglSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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