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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2ae40953052196e98c4315ff77aaecd03443bd3e1144c912404e18ee8b47c2' 
  AND token = '0RxeDe+1LQo1TKdSCl7TAVpePM/VILK/iW6wt3cJ9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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