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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9209499563ce324430f1df3257e188b1a07ee61614ccae5f122d873f4695c92d' 
  AND token = 'oMwNCJ/kVwICnCMgaUoLo6Q4xz26H5uLxTuNassoQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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