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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82efaebbed6a03240ebcbdfb67f301b1fabae0dc4030537b6a110a7fb53718c' 
  AND token = 'IHka9FCIcncPSPAW51BaC0gtpn+LOgvp3U34xlZ0Xqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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