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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5dbe33a6b20da73c7abe07ae5b33afe1f5e1e5f5c12eba2fd643f48def8cf7' 
  AND token = 'lqAKeWG//q0JOvql9U1Zo4LsfkyWbtcfCtuanmXakCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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