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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c12bd69ada7ccbd5e4aeeaf4fd0e8658b61398c68fc91d14fb5eb3f84e7133b' 
  AND token = 'ndtVnep4JH9MNGEWyd2IlLdUHqm5Ch4FKfI/MvzlSns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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