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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7bbcb5c27594ec1fe7e49063e90e411ae138b1698b1dd45c333922264cef95' 
  AND token = 'xxdPUK7rDw7mK5czV0HNkiVAHMAX+GBdvcO8Np9IKvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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