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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7eaa890649a560653ef2d8505b05e330bd89b42dcb3c3b57971e55b406a83fb' 
  AND token = '3eI3/TUzed8WSSSTLAQuxqNtc4bIH9g+fCSqLi5d11w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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