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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bfeec26c7285596708f100095492c716e94d092565354807a2c0585faeace5' 
  AND token = 'hJqY74drZv1xcWWvEw+YTcHCB78j+DA0JiOqYOKtuCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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