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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b309e04eeb9538474ff3e6bde357224aede9ae76973af4f995e4212209d12b1' 
  AND token = 'mJp7wwnBriPI0Uw+P+qCW01Ey4wMoNhNsFZF1Zf9Omo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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