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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dca6d9ea6f6ce2e9aaf96fe2fc3d68173dcdaf8b21238692278fc8270c2c7e7' 
  AND token = 'qh4AgFXImhE+TH0X23Y6qrgltceJ4vPCboOz1txpsWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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