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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be59e5a3abb81a2ce346f4f3b60e4f2874972548951e112b4338ea4f78588cd' 
  AND token = '0aO5PZT0AwjXDkaoSgKMEbTleDy7oa89cX/rRjnDko4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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