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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cfe8e66d553759aea0b9472d66dd460150f375ba82d0e82d1cb629fa3f9838' 
  AND token = 'xVdMmym8aC/pLSwGGCuyK8ikWQfIpiGxEdlE81Hj1+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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