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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492fa7d66d6b8db24b97e31d56f82126aa0e94df788088c2ec6ea3dcff2dbc28' 
  AND token = 'adrWOPKs5OrHmB+I7fbIweoJQ6KOlsNs3h0LG3UUG+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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