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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31717e96b948a8f202b00826b4c91669c4ef1439762d8ac6b60fdfd42ae10bca' 
  AND token = 'ouqknxAQ4NG4N7AieJ+wFqufp4oVh8C3YVWirPisUjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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