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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c68f836e0b8b7d10212bdcee0407f39d174b553bb707da996f79967a73131a' 
  AND token = '9mD11dnjKrpN815O8Mx/gG3nyGL/E9f95YaHI4warak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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