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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0612ba2614c78a5d97a7fbc73ae95d7789a80929324328e4c9d2b2d9be62a9f' 
  AND token = 'cDYqcT00sPpAB64ojxwOelUGs39TgBJVYx1Bes7U6Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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