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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8439790c375cbab8fc52592521a99588160022fbc04a0b2984c139de529062f7' 
  AND token = 'G/Ffxdw+/Zd3flnWCdpn1a77uAYMxm98kftSdrU+1BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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