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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f368b14fb2dce4ee8dfe06f7f494d097b74ed30b2c0b76bce392ffa69feb31' 
  AND token = 'oNSJk4xsoobHbBqR53VcXLdbpQQFd663GfMY/0aOtHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00314

JSON explain

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