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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffae884a1cc95fbef68ea25453f03cf7bd3d68e895013fd1c2d8fb7b8992437e' 
  AND token = 'ID226d83Ntm1gu8Wp+9DZ04tawey9CEcxNx9Gjezn6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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