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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299211c9ac81bc3cb0a742152507733ccedc2a96cf09105f2aef2b23c220ddbd' 
  AND token = 'aqctEzoflnFuv6hMPk0WfYhoYJ9SnG1Xl9dorlstbZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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