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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f1007dca8888e939ad0c1b37253617359bc945aed81bf1fda73dfd2a24c5b5' 
  AND token = 'N8PxgT00Vj2BLC/XfNEMwWecOGd6PFLG2n7ihwLuCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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