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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e020f62b8418d50b995d4920fd4c2c96b39e622bb4f1c72a8afc3334108e24' 
  AND token = '+0GHx3+EUnZ4BIbaxiM5gvLV7QsvV2ZrYfXRhmV227E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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