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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad2db381b31a5f7b9ab8bf5d5d990df927c8e59373902a0b04483d721467ee3' 
  AND token = 'mLuyEBGzNFlWj+YAofIT5YerOQ04ZHk78i8JLk7b7Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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