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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811ddf611886cce61ff729006bcc0f1f3f205a20bb64813a4ae0bd29c278c07c' 
  AND token = 'DtQ3IiXPzAFGGdN6OoEU9TxS6wC/xGB2+nfrtSt5DHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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