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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdb9ca44c09fa66ed7a3981c6d52c40dad244f5739a7198c868f48f41073863' 
  AND token = '3HeCE0jHM27LxJom9mdE12o02c77Xb071z6Bze0RXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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