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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058ff9d9eaefbb99e528a4acb84f3578625f947c1ee2fc9621dc7e6e2c03b05d' 
  AND token = 'Hc7lTETDz+heoK2yqafxE03v72s3nv2Xp9GAUP2/rYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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