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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bba6a5fe814758a3e09fa0b29f0396877a65fe49b12f402d5af5f93107ae6f' 
  AND token = '4ODk+StSfOYesZkKTFyvSdyuiEWN3TE4R6mnXp/IMxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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