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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437511ced8602dc5a17e56b7ad3d060b3f94954d5218fe1571c89a68b348f27e' 
  AND token = '1zOCjiBQs7Q7K9XnHIRtmkzulQch3saSIbPkPDpJFwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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