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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e35de90dcec367785390d1b755c57fd3339a7a9c20d647ef0892fed620ace3' 
  AND token = '/+3xuC5NbWwJj39Ryq1oQPkCXTtbek1bs/IY/duU7ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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