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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74e3d5c8346b18390664245179497a6a4434f92e95366fbda2145b5739a93b6' 
  AND token = 'n+ChbFxa80EmkLAjL2+semGsWfvoQTavU5GkBD/5WgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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