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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac4d7015ecf0e60552d6239eb6d86e35dd9ac4fa7120d128f8fc4ebd907a5dd' 
  AND token = 'P0mvKph3tI6BO3j3/gFet4gj43fo5AGwuuWKPUi4laU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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