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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2662942cdc55bec269589eea0537aaef8dd3fe5c80b2d12fc8bc7400796cf84c' 
  AND token = 'akI5qeqoqUBZKC4UHJm1wdIh5uQ6wqXBkSZCL9M9JvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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