SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7436d11105fad81fd37fe329efc536b351e25e49b15a9bde05c473d0fb2d4d32' 
  AND token = 'HlQJNzY0KVlxLgzHwJbCuPmDhZy5uXJrlvGh1LCgud4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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