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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5152978171236e3298c7c67c9c6c0f97a5952b9acb0ce9caa35bde13d5f169' 
  AND token = 'b7NRfA6lTbm8yfbMfnKDyY7t1tXx6150XrhZtqfUDHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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