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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72f215ddfe9eccb3975ef15f0864b64801333303443a50c4c1bcbc1b166d494' 
  AND token = 'FZ/2aidvwmiSyc8cWJy5Wsk0LiTZrGWBqpHPDk3wJ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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