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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67effdfc2b8c1df84f131cf0d09ccc74f5e18c83d5f62a9e957cd4e561bfb2f' 
  AND token = 'Lu+mjPwIH62JaQ7ABMIz7l4admoB4ZYJwINiwePaRxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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