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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3484b7532b94f746a5fe774f37dd12163ca80ff24d77d7103459f66b3a9d307b' 
  AND token = 'l8gBTgzwdYIevPPwU6fecM11jlQ4FYqjnlEW1w1oLfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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