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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e8f2e21d22a9e33acef76ec8880de03a8a173308fd97331b51521c6da4630' 
  AND token = 'nyYBSE/1kzRyKQtWd8tFk8670Bq1+Nu0TIECb/QCV04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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