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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89eda9e64399da400ce82e79487fc1e2b42e325c9811848084e51172c83afa14' 
  AND token = 'QbkQS1wVQ9yRVYa/JRlSrglPt/nJhtwTi/gAO57Vn4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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