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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4f6b6d805b77a40c09214a3b7d7c6d35f8f6bebc882f7349efcb955e6d9acd' 
  AND token = 'jZ/fDsfhavcwH5PK58RecVVHtbnSu4nj/slC8jK9EKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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