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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd2b7b87c6b399d6587416fafb9af2e5e29d972a6e89e4de1ccb5bdbd88db44' 
  AND token = 'ODAXQr0i/onHQIpGOzb9w+RLRiXyJolrT/S+tlezJdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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