SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deda29a1a17d36072a60fc9ff995d4ef984274778dbffe2f8b7022c2ff636126' 
  AND token = '7n+WxOyCvnEBIQFl6hx5qRgOVUq1uytJ7YdJqh8qCG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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