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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30b88d6e814c014ebeef80c0f39f73128c50428d87c1cf3ac6d2702c69ab605' 
  AND token = 'Xvlq4V02K3GRAXuBJ8Og33tQjd663KRJ6+qzjTszIyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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