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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc36cfcc9d49606335ed6102f8b20c0b8e3e3710b749ddf6d0fb07c68bfa525d' 
  AND token = 'OckADRakRdlgueE7sSoMnNysp8XSdvC5yjCfcowZJuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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