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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f40f1d0a434513f3e4b60b0ce41accec8071ea0d70d3f19140648b0a951f68' 
  AND token = 'ElndtMrfuW+f59MUB8gIq0YnFUG7StgPho5UEFV76QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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