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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20f3751f13ff8023dfd7936b6548d4c41096583c880992fd8bee2217f507483' 
  AND token = 'wykqlnkwFcrOrMmefDORqJit81BrP3FkOgi7IU6XM8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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