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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a794d16bc725f21f79fb5e7c275c65059851d7d52f12b22de0eb120a53da50' 
  AND token = 'GPKj+ymJlR90i+Pt4prkCfZqxslgK30m+k1ehc6igDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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