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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23301c87a7fdaa5425bd41db772de07f9b13b3c52f173bffc698a5dd6e4a2ac' 
  AND token = 'dlRU/cyT9afMEv+qb1wRNckqfq/bDoPSdDW6uBy+0oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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