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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2903d939986d90d5b81f29bed89927ef4eeaac871913b4d1cbc726d2aefc11ca' 
  AND token = 'Ueg8xhkTusucWaOk8+hJUkdsLvAUMdQnmnfIt4AzhaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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