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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91d6e3db40f65a8c41e03d40ed931995706c55e4d9a96d84de259fca27a9523' 
  AND token = '6h4LWMkmNA1Wzy2lWIiQGh3lve75GGb7/okNAIkBDTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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