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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cd9c62f21faadf941c280d92e22e597589d46b8d16d53c22c6f4210b6433f7' 
  AND token = 'sS47L2tIKhOW39CnxT8MXf2N5ikY3JV9dBNqDQuyqkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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