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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7aaf4eae5c99bf7e84b013f3f4b194b835dc99b8b24d8bbcac9145607a00a6' 
  AND token = '55A/PD42FLLkTLJjwKTw0oJ7LuRnmSvnEakXHwxSyCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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