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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33011b1f6571b1a5b6fd3f5ffbc217c9d602804d3ada3ed9ef9c953149ca7417' 
  AND token = 'Zb3B8JsLAznHecBr8UoKJBuzLR59wEjtuZTK50COii8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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