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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d213bf636782071ee4462c283f98c23a7337d59b6f671b0c9acece2889ba08' 
  AND token = '11V++77LyCHb5bRzzkjicuy4LnoV5n2d7nh80fdRhkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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