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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c32135a125e964cf32c78e7550fc3a85d1ba6e54430d6aad17f9dc324158db4' 
  AND token = 'HXTT3ccQcwHa2CLqKzPcdmDpvLoDnUA3sAB5KF/zVeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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