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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325acdf3cf26b16f54b27d5cd288076df772e488d630ae76cbcdcbbad4fe7c1a' 
  AND token = 'd67LcRnPJuDmes8nmrmbzTLIluC5jqAUZ/97Hlogdnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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