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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab51e3ea9380b362ad7aa82d4f5ed5f77a54437da54a3dc19be8b43b5c6536a7' 
  AND token = '5kVKSE5b0hhosEakv7SkXzKKbPATppO3thxvShW0jVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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