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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3e9295a26b19a996b6ddf30a75db2e11afbbfd24f11ed0390c85c06a7d9a9b' 
  AND token = 'xxespUsjBgd+X0+0WxZWxVGdg4XItH0CL/9Hh1VgoVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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