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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ec8c7b8cdeea5569a3ca06bffc6e6d8085cf573554838f6c7d8b67278dc036' 
  AND token = '4mgjywa3eGo24ocBJjZMlXbvAT+nsv3vVcid24kD08E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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