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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f9eb871a9d12dd5e8a18c0d910749c099e580df3181aad767c957167610d0d' 
  AND token = '2cG64bQbX367lMSQrt3pq5vZPq5MOE6ml+31Q/DXwpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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