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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303dd1ff487bd82b238943f55d71549543fd8a34a02b8d34a7792df38ab992ec' 
  AND token = 'rbOKQ/FnonJegUsDDNB1fRehg47Y9dJMgx66k07Fg9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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