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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67908023c312b79015c6e1a1160161e0af875a833686dcea4bee5eb3789713d4' 
  AND token = 'Ky480Is1y25CfQ39lTyKvvF0ZvgtQgfKJa7G1qTHLNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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