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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a150f1300a52a107cc5fa8ac04ffb48ea53daae256cc3c87bf70c28546e544f7' 
  AND token = 'rg992R2N3/PjOaGVJYBU1HYK22sRcgbqEtNJlgc03rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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