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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9986d373d3d67a34b16e8d7a216e690f1fe63edd6f67912e3154e087cda8cc' 
  AND token = 'EwDhMZlIehsbh5B0MQUQJtVq+OUoV5q29zeR4o7xvnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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