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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4aaa4d56cdf5dead8bc955cd2275f7699794f225e94158c9c7d749451712c3' 
  AND token = 'uv34pv2W1/vlCt2r0U0IuoftM0rBII+qFi5QYOkKoAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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