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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0e0075b869637e596948ed80b53dc788f7fee2122f5ae6bcc696aa678cd605' 
  AND token = 'J95o5aSy96aJ805ZVXyCBKQq3H9o1H4pM+Jj/Q33pa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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