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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fcc91b07f137cf95d8067621bbc2ec20f5e77619bfe5d313027220e41ede6c' 
  AND token = 'ttq3VPNPI/25F5yk18nTujpGt6BRzfx6A/s9jLi/Nl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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