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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e705d89882d19ed55158ce1d74dbfafdc7c3fb8f65e86ee117e2fc0a3df3f9' 
  AND token = 'Myqp7eOodv/japgaV7091BQhh9p5VPdA3JvE3kUQtd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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