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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c9a38545c3436ce344a285a20eb7a7a3fefaf220599a15790d88a3bae705da' 
  AND token = '4DOvurod94Y+bBfHJ36rMTtFb9wzi9B2ku+YutDohJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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