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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acef98d8bc46cafe39ecd66e81091b344d7a19f17c4c83541788de7dd45ee1d2' 
  AND token = 'Z3jEFGtFNgpkA75WwtuMOal0m2jiTU2CZrqSuNBAyK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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