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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7f45e40b38971016749825b775f87bd1e7e1a20ab3ca23fee6a4c072522d81' 
  AND token = 'JUwnm9CdeTijTP13qqdakQ6C4MjzBmHtRQFVWuMqmJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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