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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4176c33ce1b23c2e26d29108a49db898506754e3ace24d06f7ae0f3fe664e5dd' 
  AND token = 'NvGZ/URvDy7ItoD/ANOMkAjp6Yvd/D+pMB5nULIXMow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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