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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fd2bd2d13d46929de62349577e13d097583dc51372b2ba4f04d89acc9f2903' 
  AND token = 'DusEC6749jpT1qVTBwLWpZIIcWgD2o8UkDxAfOf63f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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